The CPUs hit 90% whilst the GPUs sat there doing nothing at all other than basic screen rendering rather than any encoding. However, I have just done a test render of a 1920x1080 AVI clip to MP4 using H.264 and monitored both my CPU (dual Xeon E5420) and GPU utilisation. Some comments from Corel support I found on other posts suggest that this option isn't required for CUDA cards as they are enabled and used by default. This has a CUDA based CPU and according to Corel's advertising, VS Pro X5 is designed for this chipset, and so I cannot understand why the option to enable it is not available. I have an nVidia GTX660 Ti 3GB made by EVGA. I have VideoStudio Pro X5 Ultimate (full paid for version) but I am unable to select the 'Enable Hardware Encoder Acceleration' option under Preferences/Performance as the option is greyed out. I've looked through previous forum posts and have found other people having similar problems but not yet seen any conclusive resolutions.
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